231311312211 has 16 divisors (see below), whose sum is σ = 352909023488. Its totient is φ = 132014901600.

The previous prime is 231311312189. The next prime is 231311312233. The reversal of 231311312211 is 112213113132.

It is an interprime number because it is at equal distance from previous prime (231311312189) and next prime (231311312233).

It is not a de Polignac number, because 231311312211 - 2³⁷ = 93872358739 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (231311312711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6773860 + ... + 6807921.

It is an arithmetic number, because the mean of its divisors is an integer number (22056813968).

Almost surely, 2^231311312211 is an apocalyptic number.

231311312211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231311312211 is a deficient number, since it is larger than the sum of its proper divisors (121597711277).

231311312211 is a wasteful number, since it uses less digits than its factorization.

231311312211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13582602.

The product of its digits is 216, while the sum is 21.

Adding to 231311312211 its reverse (112213113132), we get a palindrome (343524425343).

The spelling of 231311312211 in words is "two hundred thirty-one billion, three hundred eleven million, three hundred twelve thousand, two hundred eleven".